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 Post subject: Front derailleur
PostPosted: Mon May 23, 2016 12:39 pm 
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Joined: Tue May 03, 2016 6:34 pm
Posts: 12
Hi there, is this normal guys ?
I mean the flexibility of front derailleur and the frame....

https://vimeo.com/167720593


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 Post subject: Re: Front derailleur
PostPosted: Mon May 23, 2016 6:03 pm 
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Joined: Wed May 13, 2015 10:35 pm
Posts: 44
That looks entirely normal to me. You're putting a force on the cage where it was never designed to withstand such a force. No surprises that it flexes a bit. Someone with more experience is welcome to chime in but that is my thinking.


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 Post subject: Re: Front derailleur
PostPosted: Tue May 24, 2016 9:47 am 
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I'm in the normal camp too. Grab your back derailleur by the bottom of the cage and you will get some movement there too.

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 Post subject: Re: Front derailleur
PostPosted: Tue May 24, 2016 2:18 pm 
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Joined: Fri Dec 04, 2015 3:20 pm
Posts: 72
looks normal to me too ...

Just a suggestion .. you should not do it anymore as i can see the flexing of the braze on against the seat tube ... you may accidentally damage the mounting of the braze on without knowing .. just my 2 cents.


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 Post subject: Re: Front derailleur
PostPosted: Tue May 24, 2016 11:48 pm 
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Posts: 12
fh8425 wrote:
looks normal to me too ...

Just a suggestion .. you should not do it anymore as i can see the flexing of the braze on against the seat tube ... you may accidentally damage the mounting of the braze on without knowing .. just my 2 cents.

This is what I mean, that flex exactly at the tube


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 Post subject: Re: Front derailleur
PostPosted: Wed May 25, 2016 12:28 am 
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Posts: 72
banik69 wrote:
fh8425 wrote:
looks normal to me too ...

Just a suggestion .. you should not do it anymore as i can see the flexing of the braze on against the seat tube ... you may accidentally damage the mounting of the braze on without knowing .. just my 2 cents.

This is what I mean, that flex exactly at the tube


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I think what you trying to say is you suspect the seat tube is flexing too much or maybe the braze on bracket is not fasten tight enough to the seat tube. Maybe you get your LBS to take a closer look.


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 Post subject: Re: Front derailleur
PostPosted: Sun May 29, 2016 10:50 pm 
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Joined: Fri May 28, 2004 4:11 pm
Posts: 55
My vote is to tighten the cable tension.

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 Post subject: Re: Front derailleur
PostPosted: Sun May 29, 2016 11:49 pm 
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Location: Welland, Ontario
I have a bunch of bikes sitting around and I cannot get flex like that. Perhaps that's because they have clamp-on FD's or adapters.

So in answer to the question, perhaps it's normal for a frame with a flimsy braze-on.

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 Post subject: Re: Front derailleur
PostPosted: Mon May 30, 2016 12:36 am 
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Yes, my Colnagos have steel Brazeons and they don't flex at all. A lot depends on the layup of the carbon around the brazeon, or in a lot of cases, the bolt-on. Flatter frame tube profiles in that area will likely flex more. I was only trying to concentrate looking at the flex right at the Brazeon and the frame in your video and not the flex from you pulling and pushing it at the tail end of the derailleur. Whatever it is, not really much you can do about it except on the newer front derailleurs there's a support screw or "arm" (S2 Campy 2015 and onward) that lays against the frame for added support.

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 Post subject: Re: Front derailleur
PostPosted: Mon May 30, 2016 12:53 am 
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Joined: Mon Jan 13, 2014 7:26 am
Posts: 167
I think that flex is too much. What I can't say is if the seat tube is flexing as well or if it is just the braze on. If the entire seat tube flexing, just take it to a carbon specialist and have it checked.


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